Week 21 of 2027
May 24 – May 30, 2027
| Monday | May 24, 2027 | Mon · week starts |
| Tuesday | May 25, 2027 | |
| Wednesday | May 26, 2027 | |
| Thursday | May 27, 2027 | |
| Friday | May 28, 2027 | |
| Saturday | May 29, 2027 | |
| Sunday | May 30, 2027 | Sun · week ends |
All weeks of 2027
2027 is an ISO year with 52 weeks.
About ISO week 21 of 2027
ISO 8601 weeks start on Monday and end on Sunday. Week 21 of 2027 begins on Monday, May 24, 2027 and ends on Sunday, May 30, 2027. Week numbering follows the international standard: week 1 of a year is the week containing the first Thursday of January, which is why some calendar dates near January 1st belong to the previous or next ISO year.
The ISO week system is the standard for business reporting across Europe and much of the world. The US convention differs: weeks start on Sunday and week 1 contains January 1st, so US week numbers can be one ahead of or behind ISO numbers near year boundaries.
Frequently asked questions
What dates are in week 21 of 2027?
Week 21 of 2027 spans May 24 – May 30, 2027: Monday May 24 through Sunday May 30.
When is week 21 of 2027?
Week 21 of 2027 starts in 209 days, on Monday, May 24, 2027.
Why does 2027 have 52 weeks?
2027 has the usual 52 ISO weeks. Only years starting on a Thursday (or a Wednesday in a leap year) get a 53rd week.